Forum rules
Please quote the Greek text you are discussing directly in your post if it is reasonably short - do not ask people to look it up. This is not a beginner's forum, competence in Greek is assumed.

According to Brad Price, in 1 Cor 11:16 “the word contentious is a masculine adjective in the nominative case and the word custom is a feminine noun in the accusative case. If these words belonged together, there would be grammatical agreement in both gender (masculine/ feminine) and case (nominative/accusative). Since there is no agreement, custom and contention do not belong together.” Is this a fact, or is it debatable? (See Price, Brad "Commentary on 1 Corinthians 11:16". "Living By Faith: Commentary on Romans". https:https://www.studylight.org/commentaries ... ns-11.html).

Forum rules
Please quote the Greek text you are discussing directly in your post if it is reasonably short - do not ask people to look it up. This is not a beginner's forum, competence in Greek is assumed.

We don't discuss English here. Could you please quote the Greek and refer to Greek words?

If you are a beginner (I have no idea if you are or not), could you post in the Beginner's Forum instead of here?

This is not written by someone who knows Greek. It is not completely clear what "such custom" points back to, but it has nothing to do with the case or gender here. It is a matter of interpretation. In isolation this could very well point back to "being contentious" or "seeming to be contentious", but from the context is seems better to relate it to the matter in question, which is "praying without the hair covered".

Let me reiterate what has already been said, that the person who wrote this has no idea of what he is talking about. φιλόνεικος (contentious) modifies τις, (anyone). This is a good example of someone trying to use Greek grammar who doesn't know Greek.

According to Brad Price, in 1 Cor 11:16 “the word contentious is a masculine adjective in the nominative case and the word custom is a feminine noun in the accusative case. If these words belonged together, there would be grammatical agreement in both gender (masculine/ feminine) and case (nominative/accusative). Since there is no agreement, custom and contention do not belong together.” Is this a fact, or is it debatable? (See Price, Brad "Commentary on 1 Corinthians 11:16". "Living By Faith: Commentary on Romans". https:https://www.studylight.org/commentaries ... ns-11.html).

"Contentious" is an adjective describing "anyone" or "any man" - you don't even need to know any Greek - just look at the sentence in English translation.
BTW - the web page cited also seems to be written by someone who doesn't know much Greek, or how to code a webpage